HuntingNut
HuntingNut
   Login or Register
HomeCommunity ForumsPhoto AlbumsRegister
     
 

User Info

Welcome Anonymous


Membership:
Latest: RichardZ
New Today: 0
New Yesterday: 0
Overall: 13126

People Online:
Members: 0
Visitors: 591
BOT: 1
Total: 592
Who Is Where:
 Visitors:
01: Forums
02: Forums
03: Forums
04: Forums
05: Forums
06: Forums
07: Forums
08: Forums
09: Photo Albums
10: Your Account
11: Forums
12: Forums
13: Forums
14: Home
15: Forums
16: Forums
17: Forums
18: Forums
19: Forums
20: Home
21: Home
22: Forums
23: Forums
24: Forums
25: Home
26: Photo Albums
27: Forums
28: Home
29: Forums
30: Forums
31: Forums
32: Home
33: Forums
34: Forums
35: Home
36: Forums
37: Forums
38: Your Account
39: Home
40: Forums
41: Forums
42: Forums
43: Forums
44: Home
45: Forums
46: Photo Albums
47: Photo Albums
48: Forums
49: Forums
50: Forums
51: Forums
52: Forums
53: Forums
54: Your Account
55: Forums
56: Forums
57: Your Account
58: Forums
59: Home
60: Forums
61: Forums
62: Forums
63: Your Account
64: Forums
65: Forums
66: Forums
67: Forums
68: Home
69: Photo Albums
70: Forums
71: Forums
72: Home
73: Forums
74: Your Account
75: Forums
76: Forums
77: Forums
78: Forums
79: Home
80: Photo Albums
81: Forums
82: Home
83: Forums
84: Forums
85: Home
86: Your Account
87: Forums
88: Your Account
89: Forums
90: Photo Albums
91: Forums
92: Forums
93: Forums
94: Photo Albums
95: Home
96: Forums
97: Photo Albums
98: Photo Albums
99: Forums
100: Forums
101: Forums
102: Forums
103: Photo Albums
104: Forums
105: Forums
106: Forums
107: Your Account
108: Home
109: Home
110: Forums
111: Forums
112: Forums
113: Forums
114: Forums
115: Home
116: Forums
117: Your Account
118: Forums
119: Forums
120: Forums
121: Forums
122: Forums
123: Photo Albums
124: Forums
125: Forums
126: Your Account
127: Photo Albums
128: Your Account
129: Forums
130: Photo Albums
131: Photo Albums
132: Forums
133: Forums
134: Forums
135: Home
136: Your Account
137: Home
138: Forums
139: Forums
140: Home
141: Your Account
142: Home
143: Forums
144: Forums
145: Forums
146: Home
147: Forums
148: Forums
149: Home
150: Forums
151: Forums
152: Forums
153: Forums
154: Your Account
155: Forums
156: Forums
157: Forums
158: Forums
159: Home
160: Forums
161: Photo Albums
162: Forums
163: Forums
164: Forums
165: Forums
166: Forums
167: Forums
168: Forums
169: Forums
170: Forums
171: Forums
172: Forums
173: Photo Albums
174: Forums
175: Photo Albums
176: Forums
177: Forums
178: Your Account
179: Home
180: Photo Albums
181: Home
182: Home
183: Forums
184: Home
185: Home
186: Forums
187: Forums
188: Forums
189: Forums
190: Forums
191: Forums
192: Forums
193: Forums
194: Forums
195: Forums
196: Forums
197: Forums
198: Forums
199: Home
200: Forums
201: Photo Albums
202: Forums
203: Forums
204: Forums
205: Forums
206: Home
207: Forums
208: Forums
209: Home
210: Forums
211: Forums
212: Forums
213: Forums
214: Your Account
215: Forums
216: Photo Albums
217: Home
218: Forums
219: Your Account
220: Photo Albums
221: Forums
222: Home
223: Your Account
224: Forums
225: Forums
226: Home
227: Forums
228: Forums
229: Forums
230: Forums
231: Photo Albums
232: Forums
233: Your Account
234: Forums
235: Photo Albums
236: Forums
237: Forums
238: Forums
239: Forums
240: Forums
241: Photo Albums
242: Home
243: Forums
244: Forums
245: Forums
246: Photo Albums
247: Forums
248: Photo Albums
249: Forums
250: Your Account
251: Forums
252: Forums
253: Photo Albums
254: Your Account
255: Forums
256: Home
257: Your Account
258: Your Account
259: Forums
260: Home
261: Home
262: Home
263: Forums
264: Home
265: Forums
266: Your Account
267: Home
268: Forums
269: Forums
270: News
271: Forums
272: Forums
273: Forums
274: Forums
275: Forums
276: Forums
277: Forums
278: Home
279: Your Account
280: Forums
281: Forums
282: Photo Albums
283: Forums
284: Forums
285: Forums
286: Forums
287: Forums
288: Forums
289: Your Account
290: Your Account
291: Home
292: Forums
293: Forums
294: Your Account
295: Your Account
296: Home
297: Forums
298: Forums
299: Forums
300: Photo Albums
301: Forums
302: Forums
303: Forums
304: Forums
305: Forums
306: Forums
307: Forums
308: Forums
309: Home
310: Photo Albums
311: Forums
312: Forums
313: Forums
314: Your Account
315: Forums
316: Forums
317: Forums
318: Forums
319: Home
320: Forums
321: Forums
322: Your Account
323: Home
324: Forums
325: Forums
326: Forums
327: Forums
328: Forums
329: Forums
330: Forums
331: Forums
332: Forums
333: Photo Albums
334: Your Account
335: Forums
336: Forums
337: Home
338: Forums
339: Forums
340: Forums
341: Forums
342: Forums
343: Photo Albums
344: Forums
345: Photo Albums
346: Your Account
347: Your Account
348: Forums
349: Forums
350: Forums
351: Home
352: Your Account
353: Forums
354: Home
355: Forums
356: Forums
357: Forums
358: Forums
359: Your Account
360: Forums
361: Forums
362: News
363: Forums
364: Forums
365: Forums
366: Forums
367: Forums
368: Home
369: Home
370: Your Account
371: Photo Albums
372: Forums
373: Forums
374: Photo Albums
375: Forums
376: Photo Albums
377: Forums
378: Forums
379: Home
380: Home
381: Forums
382: Your Account
383: Home
384: Your Account
385: Forums
386: Home
387: Forums
388: Forums
389: Forums
390: Forums
391: Forums
392: Photo Albums
393: Forums
394: Forums
395: Forums
396: Forums
397: Your Account
398: Home
399: Forums
400: Forums
401: Forums
402: Forums
403: Your Account
404: Forums
405: Photo Albums
406: Forums
407: Forums
408: Forums
409: Forums
410: Photo Albums
411: Forums
412: Forums
413: Forums
414: Photo Albums
415: Your Account
416: Forums
417: Forums
418: Forums
419: Home
420: Forums
421: Forums
422: Forums
423: Photo Albums
424: Forums
425: Forums
426: Forums
427: Forums
428: Forums
429: Forums
430: Your Account
431: Forums
432: Forums
433: Forums
434: Photo Albums
435: Statistics
436: Your Account
437: Forums
438: Forums
439: Forums
440: Forums
441: Forums
442: Your Account
443: Forums
444: Forums
445: Forums
446: Forums
447: Forums
448: Your Account
449: Forums
450: Forums
451: Forums
452: Forums
453: Forums
454: Forums
455: Your Account
456: Forums
457: Forums
458: Forums
459: Forums
460: Forums
461: Your Account
462: Forums
463: Forums
464: Home
465: Forums
466: Photo Albums
467: Forums
468: Forums
469: Forums
470: Forums
471: Home
472: Home
473: Statistics
474: Forums
475: Forums
476: Forums
477: Forums
478: Your Account
479: Forums
480: Forums
481: Forums
482: Forums
483: Forums
484: Forums
485: Home
486: Forums
487: Your Account
488: Forums
489: Photo Albums
490: Photo Albums
491: Photo Albums
492: Home
493: Forums
494: Home
495: Forums
496: Forums
497: Home
498: Forums
499: Home
500: Forums
501: Forums
502: Your Account
503: Forums
504: Photo Albums
505: Forums
506: Forums
507: Photo Albums
508: Forums
509: Your Account
510: Home
511: Forums
512: Forums
513: Forums
514: Forums
515: Forums
516: Your Account
517: Home
518: Forums
519: Forums
520: Forums
521: Forums
522: Forums
523: Forums
524: Your Account
525: Photo Albums
526: Photo Albums
527: Forums
528: Forums
529: Home
530: Forums
531: Forums
532: Home
533: Forums
534: Forums
535: Your Account
536: Your Account
537: Forums
538: Your Account
539: Forums
540: Forums
541: Forums
542: Your Account
543: Forums
544: Forums
545: Forums
546: Photo Albums
547: Forums
548: Forums
549: Home
550: Forums
551: Forums
552: Home
553: Forums
554: Forums
555: Forums
556: Your Account
557: Photo Albums
558: Home
559: Photo Albums
560: Forums
561: Home
562: Home
563: Photo Albums
564: Home
565: Forums
566: Forums
567: Forums
568: Your Account
569: Home
570: Home
571: Your Account
572: Forums
573: Your Account
574: Forums
575: Forums
576: Photo Albums
577: Forums
578: Photo Albums
579: Your Account
580: Your Account
581: Your Account
582: Forums
583: Forums
584: Forums
585: Home
586: Forums
587: Photo Albums
588: Forums
589: Forums
590: Your Account
591: Photo Albums
  BOT:
01: Home

Staff Online:

No staff members are online!
 

Coppermine Stats
Photo Albums
 Albums: 308
 Pictures: 2451
  · Views: 820725
  · Votes: 1316
  · Comments: 86
 

Temperature Sensitivity
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
Go to page Previous  1, 2, 3, 4, 5, 6, 7  Next
Post new topic   Reply to topic   Printer Friendly Page    Forum Index » Reloading Ammunition

View previous topic :: View next topic  
Author Message
MacD
Super Member
Super Member


Joined: Apr 08, 2011
Posts: 1052
Location: Canada

PostPosted: Tue Mar 03, 2015 2:32 pm    Post subject: Re: Temperature Sensitivity Reply with quote

Wow, now that is dedication. Next we have to get you a trip to the ISS to test in near zero gravity. Wonder how far you would travel backwards in space from the recoil of a .460 Weatherby.

_________________
La a'Blair s'math n Cairdean
(Friends are good on the day of battle)
Back to top
View user's profile
Vince
Site Admin
Site Admin


Joined: May 25, 2005
Posts: 15704
Location: Brisbane AUSTRALIA

PostPosted: Tue Mar 03, 2015 7:01 pm    Post subject: Re: Temperature Sensitivity Reply with quote

Gee Mac...don't put ideas into his head mate...Slim is just as likely as not to do it...or go insane contemplating the answer. Scratch Nuts Nuts Very Happy Very Happy Laughing Laughing Laughing

_________________
Cheers, Vince Cheers

Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done)
Back to top
View user's profile AIM Address MSN Messenger Yahoo Messenger Photo Gallery
PaulS
Super Member
Super Member


Joined: Feb 18, 2006
Posts: 4330
Location: South-Eastern Washington - the State

PostPosted: Tue Mar 03, 2015 7:39 pm    Post subject: Re: Temperature Sensitivity Reply with quote

Take the velocity times the mass of the powder and projectile and devide that by your mass and that is how fast you will travel backwards (if fired from you center of mass). If you fire from the shoulder you are likely to do somersaults with twisting involved but very little directional movement.

_________________
Paul
__________________
Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
NEVER exceed maximum listed loads
Back to top
View user's profile Send e-mail
slimjim
Super Member
Super Member


Joined: May 16, 2009
Posts: 8314
Location: Fort Worth TX

PostPosted: Tue Mar 03, 2015 8:24 pm    Post subject: Re: Temperature Sensitivity Reply with quote

hmmm, maybe I could make a hand-held thruster pack that uses 22 LR. carry extra clips to recharge!

_________________
"To anger a conservative, lie to him. To anger a liberal, tell him the truth." - Theodore Roosevelt

"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein
Back to top
View user's profile Photo Gallery
PaulS
Super Member
Super Member


Joined: Feb 18, 2006
Posts: 4330
Location: South-Eastern Washington - the State

PostPosted: Tue Mar 03, 2015 8:35 pm    Post subject: Re: Temperature Sensitivity Reply with quote

You could get better speed with a seltzer bottle filled with mercury. Nasa uses water and air pressure for the manuvering thrusters on the EVA suits.

_________________
Paul
__________________
Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
NEVER exceed maximum listed loads
Back to top
View user's profile Send e-mail
slimjim
Super Member
Super Member


Joined: May 16, 2009
Posts: 8314
Location: Fort Worth TX

PostPosted: Sat Mar 14, 2015 2:55 pm    Post subject: Re: Temperature Sensitivity - Getting Close Reply with quote

I'm getting close to being able to conduct the temperature sensitivity testing. I've got the cold and hot of things figured out.

Crock-pot on warm with magazines sealed in freezer bags immersed in water. Cut-up an old dishwasher rack to hold them upright. I'm not worried about handing loose rounds with my hands because they basically are at the temperature I want to test at.

Used closed sell foam cust to fit the top of the cooler. Slots cut out to hold magazines and temperature probes in .270 cases. Frozen meat below the foam which should keep the air colder than ice (may still use it anyway. Cut-outs will be used to seal the mag slots when removed. Wrapped insulation around metal mags and will use winter gloves to handle the cold rounds.

Will have a large cooler with ice to cold soak the barrels with between firing sessions with cold cases. 4 shots in 10 seconds with .223 and 6.8mm. 2 shots in 10 seconds with .270 then back into the cooler.

Rounds are all sequenced into the magazines. Next Friday is the target date!



crockpot to keep ammo temp near 100f.jpg
 Description:
 Filesize:  121.66 KB
 Viewed:  8899 Time(s)

crockpot to keep ammo temp near 100f.jpg


foam sealed cooler to keep ammo around 25f.jpg
 Description:
 Filesize:  201.49 KB
 Viewed:  8899 Time(s)

foam sealed cooler to keep ammo around 25f.jpg


_________________
"To anger a conservative, lie to him. To anger a liberal, tell him the truth." - Theodore Roosevelt

"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein
Back to top
View user's profile Photo Gallery
PaulS
Super Member
Super Member


Joined: Feb 18, 2006
Posts: 4330
Location: South-Eastern Washington - the State

PostPosted: Sun Mar 15, 2015 8:36 am    Post subject: Re: Temperature Sensitivity Reply with quote

Your preparations look spot on to me.
It will bee interesting to see the results.

_________________
Paul
__________________
Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
NEVER exceed maximum listed loads
Back to top
View user's profile Send e-mail
slimjim
Super Member
Super Member


Joined: May 16, 2009
Posts: 8314
Location: Fort Worth TX

PostPosted: Mon Apr 20, 2015 5:54 pm    Post subject: Powder Temperature Sensitivity Test Results – Summary Reply with quote

Powder Temperature Sensitivity Test Results – Summary

Well, the two powders I came to rely on last year, 1200R with 100gr bullets and CFE223 with 130gr bullets, were the worst performers in varying temperature conditions (summary of data in the table below). Seeing their velocities vary from range session to range session as summer changed to fall then to winter is what motivated me to conduct this test to begin with. In that sense, this temperature sensitivity testing validated what I was experiencing. Even though 1200R has shown good accuracy potential, I have become “gun shy” and will likely stop using it in the 6.8mm. Not only have I had a 250 fps spread in average velocity with 100 AccuBonds this past year, in hot weather, an individual bullet’s velocity can be unpredictable. 1200R did it during this testing with one of the rounds dropping 300 fps below the other. This is the 4th time I’ve recorded this happened in warm/hot conditions and I’m still on my first box of 100gr AccuBonds. I will continue to use CFE as its performance potential with 130gr bullets is so good. At least I understand CFE’s limitations when cold weather approaches. I may need to further investigate the CFE’s sensitivity to temperature with different primers.

Even though 100 rounds were fired during this test session, there were so many different bullets and powders that the results should not be considered statistically significant. Consider these results as relative performance between powders, e.g., Re10x was less sensitive to temperature than Re7. Also, only two temperature test points were measured (e.g., 20F and 100F) and assumed a linear drop in velocity with decreasing temperature. This is likely with most powders but not all. Note, references listed earlier in this thread pointed out that a powder’s sensitivity to temperature is different for different calibers and for different weight bullets within a caliber which is also reflected in this data.



summary temperature sensitivity results.jpg
 Description:
 Filesize:  20.5 KB
 Viewed:  8353 Time(s)

summary temperature sensitivity results.jpg


_________________
"To anger a conservative, lie to him. To anger a liberal, tell him the truth." - Theodore Roosevelt

"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein


Last edited by slimjim on Mon Apr 20, 2015 6:06 pm; edited 1 time in total
Back to top
View user's profile Photo Gallery
slimjim
Super Member
Super Member


Joined: May 16, 2009
Posts: 8314
Location: Fort Worth TX

PostPosted: Mon Apr 20, 2015 5:58 pm    Post subject: Powder Temperature Sensitivity Test Results - Detailed Data Reply with quote

Powder Temperature Sensitivity Test Results - Detailed Data

Ambient temperature started at 52F and rose to 65F during the test session. I had plenty of back-ups - a digital and analog thermometer for both hot and cold conditions plus three chrono readings for each shot in case one of the instruments dropped a shot. The cold process for controlling the temperature of cartridges in the cooler using frozen meat (tubes of ground venison and sausage links) was very stable, starting at 16F warming to 20F during the test session. The testing started about an hour and a half after the cooler was packed. A Zero-Degree sleeping bag added extra insulation/insurance. The still frozen meat went straight back into the freeze upon returning home. The hot temperature process using the crockpot went from 105F down to 96F by the time hot testing was complete. I may have to increase the range for hot conditions. While unpacking at 75F ambient, the instrumented cartridge was left in the sun and stabilized at 105F. A hotter day would be even worse.

During the cold testing, I tried cooling the barrels down with ice between test cycles - every four shots with the .223 and 6.8mm, every two shots with the .270 Win. Letting the barrels draw cool air from the bottom of the cooler with their actions open worked the best (see picture below, right side). All barrels were cold to the touch (approximately 45F) when starting any cold testing. Warm testing took less time and barrels cooled to be slightly warm to the touch by their next cycle. In prior testing, barrel temp was not found to be a primary factor with regard to a powder’s temperature sensitive for the limited numbers of rounds fired in a test cycle. This was verified during this testing as the 2nd rounds of each bullet/powder combination fired were even split in their bias, faster or slower.



detailed temperature sensitivity results.jpg
 Description:
 Filesize:  62.97 KB
 Viewed:  8351 Time(s)

detailed temperature sensitivity results.jpg


cooling uppers - one on right was best.jpg
 Description:
 Filesize:  18.67 KB
 Viewed:  8351 Time(s)

cooling uppers - one on right was best.jpg


_________________
"To anger a conservative, lie to him. To anger a liberal, tell him the truth." - Theodore Roosevelt

"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein


Last edited by slimjim on Mon Apr 20, 2015 6:17 pm; edited 2 times in total
Back to top
View user's profile Photo Gallery
slimjim
Super Member
Super Member


Joined: May 16, 2009
Posts: 8314
Location: Fort Worth TX

PostPosted: Mon Apr 20, 2015 6:03 pm    Post subject: Observations Reply with quote

Observations

• CFE223 showed sensitivity to temperature across the calibers. BTW, it really does cut down on copper fouling, essentially eliminating it in my experience.
• AA2200 was consistent across .223 and 6.8mm with lead-core bullets. TAC was the opposite.
• TAC was very consistent with temp change with heavy bullet in .223
• IMR 8208 XBR, for being promoted as an extreme powder that is insensitive to temperature change, did not do as well as expected in any of the 3 cartridges.
• Re7 was the most temperature sensitive of the typical 6.8mm powders tested.
• I believe 1200R was actually worse than Re7 but cannot be compared because it dropped 300 fps when hot with one shot. This is the 4th time I've seen 1200R do this at the range.
• The results with primers in the 6.8 were not what I’ve been taught, e.g., magnum primers do better in cold and provide more velocity than standard primers.
___ CCI 400 standard primers did not hurt 6.8mm in cold.
___ CCI 450 seemed to be more consistent in the warm conditions.
___ CCI 400 standard primers appeared to do as well or better than CCI 450 magnum primers in 6.8mm with respect to muzzle velocity.


I’m just reporting test data here but know these primer results will cause debate. So, I went back and did some verification on primers and this was repeatable for the lot of CCI 400 and 450 primers that I have in my possession. Even though muzzle velocities were close, the groupings were noticeably different with the CCI 450s providing tighter groups in my rifle - well that would make sense as all the loads but the 150 RN were developed with CCI 450 primers. The Federal 150 Round Nose groups were the first time I shot these bullets. There was no load development, just picked a powder charge to see what both primers would do.

Load _________________CCI 400 ______CCI 450 _____ 60 F
95 TTSX 30.3gr AA2200 _ 2879 fps _____ 2869 fps (3-shot avg)
110 BTHP 28.6gr AA2200_ 2635 fps _____ 2638 fps (5-shot avg)
150 RN 31.3gr CFE ______ 2279 fps _____ 2269 fps (3-shot avg)

I predict I will be doing more of this type of testing. I just can’t envision accumulating a large variety of powders like I have with bullets.

_________________
"To anger a conservative, lie to him. To anger a liberal, tell him the truth." - Theodore Roosevelt

"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein
Back to top
View user's profile Photo Gallery
MacD
Super Member
Super Member


Joined: Apr 08, 2011
Posts: 1052
Location: Canada

PostPosted: Sun Apr 26, 2015 8:41 am    Post subject: Re: Temperature Sensitivity Reply with quote

Very interesting results. A hot primer may mean faster ignition but greater peak pressure with a faster burn. This may result in the same drop in velocity seen using a faster powder in a calibre and bullet weight than is usual. The combination is less efficient as it gives off more energy as heat and less to propel the bullet. Since single base powders are more temperature sensitive, the use of a hotter primer may bring a retarded powder back up to its normal burn rate. The thinking about using hotter primers in cold weather may not apply as well to double base powders.

_________________
La a'Blair s'math n Cairdean
(Friends are good on the day of battle)
Back to top
View user's profile
slimjim
Super Member
Super Member


Joined: May 16, 2009
Posts: 8314
Location: Fort Worth TX

PostPosted: Mon Apr 27, 2015 4:46 am    Post subject: Re: Temperature Sensitivity Reply with quote

MacD, the magnum primer performed as expected in the .270 with IMR4350. This was not the case in the 6.8mm. Still pondering. Thanks for stoking the embers with fuel for thought.

_________________
"To anger a conservative, lie to him. To anger a liberal, tell him the truth." - Theodore Roosevelt

"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein
Back to top
View user's profile Photo Gallery
MacD
Super Member
Super Member


Joined: Apr 08, 2011
Posts: 1052
Location: Canada

PostPosted: Mon Apr 27, 2015 5:23 am    Post subject: Re: Temperature Sensitivity Reply with quote

IMR4350 being a slow single base powder would benefit from a hotter primer in cold conditions if my postulation is correct. Did you use it in the 6.8 ? I reviewed the data you presented but didn't see it there.

_________________
La a'Blair s'math n Cairdean
(Friends are good on the day of battle)
Back to top
View user's profile
slimjim
Super Member
Super Member


Joined: May 16, 2009
Posts: 8314
Location: Fort Worth TX

PostPosted: Mon Apr 27, 2015 10:37 am    Post subject: Re: Temperature Sensitivity Reply with quote

All the 6.8 used magnum primers - CCI 450s. The two highlighted were standard primers - CCI 400s. It seems the 450s made the biggest difference in hot temps with the large powder charge of CFE223. Otherwise it was a wash. Hmmm....

_________________
"To anger a conservative, lie to him. To anger a liberal, tell him the truth." - Theodore Roosevelt

"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein
Back to top
View user's profile Photo Gallery
slimjim
Super Member
Super Member


Joined: May 16, 2009
Posts: 8314
Location: Fort Worth TX

PostPosted: Wed Jul 22, 2015 7:26 pm    Post subject: Temperature Sensitivity 2 Reply with quote

I picked up two more powders that are promoted as temperature insensitive: IMR 4166 and H322. IMR 4166 is new to the market, better suited to .223 and .308 applications but did testing with 150gr bullets in the 6.8mm (case full) and 130gr bullets in the .270 (well under case capacity) as a comparison. H322 has been around for a while and is applicable to the 6.8mm SPC. Cold rounds were fired before hot. No need to do any special environmental preparation for the hot powder testing. Temperatures reached 99F in the shade that afternoon. Summary of results and the details are below.



summary results 2.jpg
 Description:
 Filesize:  53.34 KB
 Viewed:  7904 Time(s)

summary results 2.jpg


detailed temperature sensitivity results 2.jpg
 Description:
 Filesize:  171.26 KB
 Viewed:  7904 Time(s)

detailed temperature sensitivity results 2.jpg


_________________
"To anger a conservative, lie to him. To anger a liberal, tell him the truth." - Theodore Roosevelt

"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein


Last edited by slimjim on Fri Jul 24, 2015 4:55 am; edited 4 times in total
Back to top
View user's profile Photo Gallery
Display posts from previous:   
Post new topic   Reply to topic   Printer Friendly Page    Forum Index » Reloading Ammunition
Page 5 of 7
All times are GMT - 7 Hours
Go to page Previous  1, 2, 3, 4, 5, 6, 7  Next



Jump to:  


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Valid CSS! Valid HTML 4.01!
Click to check if this page is realy HTML 4.01 compliant for speed :)

All logos and trademarks in this site are property of HuntingNut.com.
The comments are property of their posters, all the rest © 2011 by HuntingNut.com
Interactive software released under GNU GPL, Code Credits, Privacy Policy

.: Upgraded to DragonFly 9.2 by *Dizfunkshunal* :.